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Leases - The Company as Lessee - Schedule of operating leases (Detail) - USD ($)
Dec. 31, 2019
Jan. 01, 2019
Lessee, Lease, Description [Line Items]    
Non current assets $ 473,132 $ 1,879,085
Liabilities 473,132 1,492,697
Operating lease liabilities   386,388
Chartered-in contract greater than 12 months [Member]    
Lessee, Lease, Description [Line Items]    
Non current assets 386,388 1,879,085
Liabilities 386,388 1,492,697
Operating lease liabilities   $ 386,388
Office leases [Member]    
Lessee, Lease, Description [Line Items]    
Non current assets 86,744  
Liabilities $ 86,744